Naztech 10356 Charging Cradle Dock for iPhone/iPad 30 Pin - Non-Retail Packaging - White Compact Design Charges and Syncs iPhone 3G/3GS/iPods Stereo Audio Output The iPhone 3G dock has been designed and tested specifically for the Apple iPhone 3G and 3GS. This USB 2.0 sync data cable can connect your iPhone or iPod directly or through a dock to your computer's USB port for efficient sync and charge.